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Prateek Asked :

23-06-2021 D.C. Machines

Q. How is the selection of number of poles made in AC and DC machines?

A. any number of poles can be used for both AC and DC machines
B. fixed number of poles in both AC and DC machines
C. fixed number of poles in DC machines and any number of poles in AC machines
D. fixed number of poles in AC machines and any number of poles in DC machines


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Dapzoi Verified
Commented on 2021-06-23 19:45:56 (IST)
Answer: D

Explanation: When it comes to DC machines, any number of poles can be made use of, but it should be within a range. Whereas in AC machines the number of poles is fixed by supply frequency and speed.